You keep saying 8 months like it's a given.
I just finished (well, almost, but at least I can move back in) a custom remodel of just a 1000 sq. ft. home. I tried to do it in 3 months, I planned for 4, and it has taken 6 (at about 50% over my original budget too, but I blame my extravagant tastes for the cost overrun, not the builder).
So with all sincerity, I hope that you are able to move in in just 8 months. But realistically, 12 is entirely likely, so accepting that possibility now will alleviate a lot, and I mean a whole lot, of stress. This is what I was told at the beginning of my remodel would happen by several friends, and I didn't believe them then. I sure do now, so I'm passing on their advice. Best of luck.